So, I let my battery run to zero by mistake. Now, when I try to charge it, it boots, shows the charging sign for 20secs, then the question mark over the battery and then reboots. I've tried charging it from my USB drive and directly from a power source, but there is no change whatsoever. This has happened once before but it someone managed to hold some charge after a day. I really don't know what to do. I've tried a soft reset and it still goes back to the same screen. I would love any help I can get.